PHYS 1302W Lecture 1: 25- Current and Resistance 9-28-16
Document Summary
A current is a movement of electric charge from one location to another. A positive charge moving to the right forms a current to the right. A negative charge moving to the right forms a current moving to the left. In metals, the charges that move are electronics, negatively charged particles. Some of the most loosely held electrons can move around within the metal quite freely. In fact, they move around in random directions at about 10^6 m/s all the time. If e=0 in the metal, an electron jiggles around but has no net movement in one direction or the other. But if e is to the right in the metal, each segment in that random motion has a small additional motion to the right (q>0) The slow net motion results in a current. If a net charge dq flows through an area in time dt, the current through that area is.
